Lock for gearing.



G. O. LEOPOLD.

LOOK FOR GEARING.

APPLIUATION 11LnD'nEc.za,19oo.

Patented Apr. 19,'1910.

2 SHEETS-SHEET 1.

4 @y @MMM G. 0. LEOPOLD. 1.00K 'Fon GBARING.

APPLICATION FILED DEU.23,1909.

955,81 5, Patented Apr. 19, 1910.

Z SHEETS-SHEET 2.

wilg-LGSS l zofgc 0. 160790125 MM im f M Aunnsw u ummm m Pummummmmrmwmmmnn n r GEORGE 0. LEOPOLD, OF

IVIFG- CO., OF PHILADELPHIA, PENNSY VANA.

PHILADELPHIA, PENNSYLVANIA, .ASSIGNOR TO NORTH BROS LVANIA, ACORPORATION OF PENNSYL- LOCK FOR GEARING.

Specification of Letters Patent.

Patented Apr. 19, 1910.

Application filed December 23, 1909. Serial No. 534,705.

To all whom it may concern:

Be it known that I, Geenen O. Lnorora), a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovement-s in Locks for Gearing, of which the following is aspecification.

My invention relates to certain improvements in mechanism for lockinggearing, especially the gearing of breast drills.

The object of the invention is to so lock the gearing that the spindlewill not turn when the chuck is opened or closed to remove a drill bitor place it in position. This ob'- ject I attain in the followingmanner, reference being had to the accompanying drawings, in whichFigure l, is a side view of a breast drill illustrating my invention,part of the mechanism being in section taken on the line 1--1, Fig. 2,the bolt being withdrawn; Fig. 2, is a side view of sutlicient of thedrill to illustrate my invention, looking in the direction of the arrow2, Fig. 1; Fig. 3, is a sectional view on the line 3-3, Fig. 2, showingthe bolt thrown; Fig. 4, is a view looking in the direction of the arrowLl, Fig. 3; Fig. 5, is an enlarged sectional view on the line 5-5, Fig.2; and Figs. (5, 7, 8 and 9, are detached perspective views illustratingmy improvement.

A is the frame of a breast drill having bearings a, a for the spindle B.This spindle has at one end a chuck b of any suitable type, in which thedrill bit is clamped. On the spindle B are two bevel pinions c, c', thepinion c is secured to the spindle, while the pinion c is looselymounted thereon.

A is a bracket projecting from the frame A and carried by this bracketis a stud a on which is mounted the bevel gear wheel l). This bevel gearwheel meshesI with the two pinions c, o. The wheel has an extended huband is held in place by a washer sccured by a screw a3, as shown clearlyin Fig. 1.

E is an arm having a handle c, this arm is secured to the bevel wheel Din the present instance by a screw e. The lower portion of the arm isforked and the portions e2 lit over the hub of the wheel so that thehandle is held rigidly to the wheel. 0n turning the handle motion isimparted to the spindle B.

In the ordinary type of breast drill, in

order to open or close the chuck b the gears have to be held by one handso as to prevent the spindle turning with the shell b of the chuck whichis grasped by the other hand.

The object of this invention is to provide means for locking the gearingso that when it is desired to open or close the chuck it is notnecessary to hold the gearing with the hand.

z' is a bolt adapted to slide in a cavity d in the hub al and back ofthis bolt is a spring z" which tends to force the bolt forward. An armprojects at an angle from the bolt and rests in a cavity c in the arm E,Fig. 8, and this cavity has a cam face e and in the cam face is a recessc5, so that when the arm 2 is shifted from the position shown in Fig. 4to that shown in Fig. 2, the bolt will be withdrawn clear of the bracketagainst pressure of the spring, as illustrated in Fig. l. If the arm isturned to the position illustrated in Fig. 4, then the bolt is free tobe projected into any one of the openings f in the bracket A', asillustrated in Fig. 3, thus locking the gear wheel D to the bracket orframe of the breast drill, and when in this position the chuck can beopened and closed without grasping the gearing, as the spindle is lockedby the bolt z' through the medium of the gearing.

I claim 1. The combination of a frame having a bearing provided with anopening, a gear wheel mounted on the bearing, a spindle mounted inbearings on the frame, a pinion on the spindle meshing with the gearwheel, and a bolt carried by the gear wheel and adapted to be projectedinto the opening in the bearing to lock the wheel to the bearing and thespindle to the frame.

2. The combination of a bracket, a spindle on the bracket, a gear wheelmounted on the spindle, said bracket having one or more openings, a boltcarried by the wheel and adapted to enter one of said openings, a cam onthe gear wheel, and an arm on the bolt by which it is turned, said armresting against the cam so that on turning the bolt it will be moved toand from the bracket.

3. The combination of a bearing, having a spindle, a gear wheel mountedon the spindle, a bolt carried by the gear wheel, a

- spring back of the bolt, an arm on the bolt, name to thisspecification, in the presence of a handle 'adapfted to the geail'1Wheel and haltWo subscribing Witnesses. ing a cam sur ace over Whc thearm on t e bolt travels when turned, said cam causing GEORGE O LEOPOLD'5 thebolt t0 beV Withdrawn against the pres- Witnesses:

sure of the spring. WALTER CHISM, In testimony whereof, I have signed myWM. A. BARR.

